You've probably looked at your distorted reflection in a shiny holiday ornament, but you may be surprised to learn what the reflections in a pyramid of silvery balls are like. The behavior of light in a stack of mirrored balls can help mathematicians and physicists picture how electrons wander through the materials used to make transistors, computer chips, and other electronic devices. [Produced 10 times a year by the publishers of Cricket magazine (in association with Smithsonian magazine), Muse features articles and activities for children 8 years old and up.]